Welcome come the orthocenter calculator - a device where you can conveniently find the orthocenter of any triangle, be it right, obtuse or acute. If you're unsure what the orthocenter the a triangle is, we've ready a quite explanation, and also an orthocenter definition. Afterward, you have the right to learn how to discover the orthocenter with a action by step collection of indict (or you have the right to just usage the orthocenter formula, sustained by trigonometry). And, as soon as you've operated your means though all of this, there room some orthocenter properties wait for you, and also some bonus distinct cases...

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What is the orthocenter of a triangle? Orthocenter definition

The orthocenter that a triangle is the allude where the altitudes the the triangle intersect. The three altitudes the a triangle are constantly concurrent, meaning that they accomplish at the very same point. Together a quick reminder, the altitude is the heat segment that is perpendicular a side and touches the edge opposite come the side.

How to find orthocenter?

Now that you've been introduced to the orthocenter definition, let's inspect how to find it. The easiest, many straightforward method to calculation the orthocenter of a triangle is to monitor this step-by-step guide:

To start, let's assume the the triangle ABC has actually the vertex works with A = (x₁, y₁), B = (x₂, y₂), and also C = (x₃, y₃).

slope = (y₂ - y₁) / (x₂ - x₁)

Calculate the slope that is perpendicular to side AB. The way, you'll find the steep of the triangle's altitude for that side. The equation because that the altitude's steep is:

perpendicular slope = — 1 / slope

Then you require to find the equation for the line containing the triangle's altitude - the one the goes v vertex C (x₃, y₃). Use the equation for the suggest slope formula:

y - Y = m * (x - X)

For our example it will be:

y - y₃ = m * (x - x₃), whereby m = —1 / slope = - (x₂ - x₁) / (y₂ - y₁)


y = y₃ - (x₂ - x₁) * (x - x₃) / (y₂ - y₁)

Repeat the steps for another side, one of two people AC or BC.

y = y₂ - (x₃ - x₁) * (x - x₂) / (y₃ - y₁)

How to discover orthocenter - one example

The equations in the above paragraph might look scary, yet you don't have to worry, it's no that difficult! Let's examine how to discover the orthocenter v an example, whereby our triangle ABC has the crest coordinates: A = (1, 1), B = (3, 5), C = (7, 2).

Find the slope:

AB side slope = (5 - 1) / (3 - 1) = 2

Calculate the steep of the perpendicular line:

perpendicular steep to abdominal muscle side = - 1/2

Find the line equation:

y - 2 = - 1/2 * (x - 7) for this reason y = 5.5 - 0.5 * x

Repeat for an additional side, e.g., BC;

BC next slope = (2 - 5) / (7 - 3) = - 3/4

perpendicular steep to BC side = 4/3

y - 1 = 4/3 * (x - 1) so y = -1/3 + 4/3 * x

Solve the device of straight equations:

y = 5.5 - 0.5 * x andy = -1/3 + 4/3 * x


5.5 - 0.5 * x = -1/3 + 4/3 * x

35/6 = x * 11/6

x = 35/11 ≈ 3.182.

Substituting x into either equation will offer us:

y = 43/11 ≈ 3.909

Of course, you'll achieve the same an outcome from our orthocenter calculator💪! Just kind the 3 triangle vertices and also we'll calculation the orthocenter coordinates for you.

Orthocenter formula

A an ext compact formula for discover a triangle's orthocenter exists, but you have to be familiar with the ide of the tangent. To uncover the orthocenter coordinates H = (x, y), you have to solve this equations:

x = (x1 * tan(α) + x2 * tan(β) + x3 * tan(γ)) / (tan(α) + tan(β) + tan(γ))

y = (y1 * tan(α) + y2 * tan(β) + y3 * tan(γ)) / (tan(α) + tan(β) + tan(γ))

While those orthocenter formulas might look method easier than the previous instructions on just how to uncover the collaborates of the center, you more than likely don't have actually the triangle's angles, α, β, and also γ, provided, carry out you?

So you'll more than likely need to discover them first. Usage the Pythagorean to organize to find the size of the triangle's sides. Then use the regulation of cosines to uncover the angles of the triangle. Our orthocenter calculator has all of this constructed in.

Orthocenter properties and trivia

There room some interesting orthocenter properties! The orthocenter:

lies inside the triangle for acute triangles,lies outside the triangle in obtuse triangles.

Did you know that...

three triangle vertices and the triangle orthocenter of those points type the orthocentric system. If you do a triangle the end of any kind of three of this points, the continuing to be one will be the orthocenter.

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reflection the the orthocenter over any type of of the 3 sides lies on the circumcircle that the triangle.the angle developed at the orthocenter is supplementary to the edge at the vertex.in every non-equilateral triangle, there's a line going v all important triangle centers (orthocenter, centroid, circumcenter, nine-point circle) - it's called Euler line.